LAS VEGAS - There's something about executives in the cloud computing business that makes them unable to resist bashing each other.

And within his first 10 minutes on stage at the Amazon Web Services conference on Wednesday, AWS CEO Andy Jassy was already at it.

His target: Oracle Executive Chairman Larry Ellison, whose face was pictured on a giant screen, peering haplessly over the edge of pie chart's tiny red sliver and looking like a cartoon villain in some old slapstick movie.

Some people in the cloud business don't show up on the chart, Jassy said, referencing Ellison - they only "pop in."

Amazon Web Services has 51.8% of the market share, Jassy said. In comparison, Microsoft has 13.3%, Alibaba has 4.6%, and Google has 3.3%.

"These old guard databases like Oracle and SQL servers are expensive and not customer serving," Jassy said later in his talk. "People are sick of it, and now they have choice."

Previously, Ellison had taken a shot at Amazon during Oracle's conference, saying Amazon's database was like a semi-autonomous car, saying "You get in, you start driving, you die." Oracle declined to comment on the keynote.

Jassy also spent some time emphasizing that Amazon is way ahead of Microsoft. This year, AWS saw 46% growth. In comparison, Microsoft Azure, or "the next closest provider," as Jassy kept calling it, saw a revenue growth of 76%, but it doesn't specifically break out its revenue for cloud.

"Because it's so expensive to pay for these services in the cloud, it doesn't take long for builders to know the difference and depth in these platforms," Jassy said.